[MIPS] IP22: Fix hang due to messing with timer interrupt handler

As IP22 is now using do_IRQ for timer interrupt, don't mess with
interrupt handler any longer
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/sgi-ip22/ip22-time.c

@@ -192,12 +192,3 @@ void indy_8254timer_irq(void)
 	ArcEnterInteractiveMode();
 	irq_exit();
 }
-
-void __init plat_timer_setup(struct irqaction *irq)
-{
-	/* over-write the handler, we use our own way */
-	irq->handler = no_action;
-
-	/* setup irqaction */
-	setup_irq(SGI_TIMER_IRQ, irq);
-}